XRCC1 and red color blindness: A higher proportion of the cases carry the XRCC1 rs25487 AA genotype than the controls (49.50% vs. 15.84%, respectively) and the risk of CBP was correspondingly increased (OR = 14.063; 95% CI: 6.545–30.214; P < 0.001) compared to individuals carrying the GG genotype.